Photothermal time explained

Photothermal time (PTT) is a product between growing degree-days (GDD) and day length (hours) for each day. PTT = GDD × DL[1] It can be used to quantify environment,[2] as well as the timing of developmental stages of plants.[3]

Notes and References

  1. .Ravi Kumar. S.. Hammer. Graeme L.. Broad. Ian. Harland. Peter. McLean. Greg. March 2009. Modelling environmental effects on phenology and canopy development of diverse sorghum genotypes. Field Crops Research. 111. 1–2. 157–165. 10.1016/j.fcr.2008.11.010. 0378-4290.
  2. Li. Xin. Guo. Tingting. Mu. Qi. Li. Xianran. Yu. Jianming. 2018-06-07. Genomic and environmental determinants and their interplay underlying phenotypic plasticity. Proceedings of the National Academy of Sciences. 115. 26. 6679–6684. 10.1073/pnas.1718326115. 0027-8424. 29891664. 6042117. 2018PNAS..115.6679L . free.
  3. Wilczek. Amity M.. Roe. Judith L.. Knapp. Mary C.. Cooper. Martha D.. Lopez-Gallego. Cristina. Martin. Laura J.. Muir. Christopher D.. Sim. Sheina. Walker. Alexis. 2009-02-13. Effects of Genetic Perturbation on Seasonal Life History Plasticity. Science. 323. 5916. 930–934. 10.1126/science.1165826. 0036-8075. 19150810. 2009Sci...323..930W. 206516277. free.

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